Imaging lens

ABSTRACT

There is provided an imaging lens with high-resolution which satisfies demand of the wide field of view, the low-profileness and the low F-number, and has excellent optical characteristics. An imaging lens comprises in order from an object side to an image side, a first lens having a convex surface facing the object side near an optical axis and positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having a concave surface facing the image side near the optical axis and negative refractive power, wherein an image-side surface of said seventh lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, said second lens has positive refractive power near the optical axis, and said sixth lens has plane surfaces both on the object side and the image side and is formed as a double-sided aspheric lens.

The present application is based on and claims priority of a Japanesepatent application No. 2018-098997 filed on May 23, 2018, the entirecontents of which are hereby incorporated by reference.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to an imaging lens which forms an image ofan object on a solid-state image sensor such as a CCD sensor or a C-MOSsensor used in an imaging device, and more particularly relates to animaging lens which is built in a smartphone and a mobile phone whichbecome increasingly compact and excellent in performance, an informationterminal such as a PDA (Personal Digital Assistant), a game console, PCand a robot, and moreover, a home appliance with camera function, amonitoring camera and an automobile.

Description of the Related Art

In recent years, it becomes common that camera function is mounted in ahome appliance, information terminal equipment, an automobile and publictransportation. Demand of products with the camera function is moreincreased, and development of products is being made accordingly.

The imaging lens mounted in such equipment is required to be compact andto have high-resolution performance.

As a conventional imaging lens aiming high performance, for example, theimaging lens disclosed in Patent Document 1 (JP2017-125887A) has beenknown.

Patent Document 1 discloses an imaging lens comprising, in order from anobject side, a first lens having negative refractive power, a secondlens having negative refractive power, a third lens having positiverefractive power, a fourth lens having negative refractive power, afifth lens having positive refractive power, a sixth lens havingpositive refractive power, and a seventh lens having negative refractivepower.

SUMMARY OF THE INVENTION

In lens configurations disclosed in the Patent Document 1, when widefield of view, low-profileness and low F-number are to be realized, itis very difficult to correct aberrations at a peripheral area, andexcellent optical performance can not be obtained.

The present invention has been made in view of the above-describedproblems, and an object of the present invention is to provide animaging lens with high resolution which satisfies demand of the widefield of view, the low-profileness and the low F-number in well balanceand excellently corrects aberrations.

Regarding terms used in the present invention, “a convex surface”, “aconcave surface” or “a plane surface” of lens surfaces implies that ashape of the lens surface near an optical axis (paraxial portion).“Refractive power” implies the refractive power near the optical axis.“A pole point” implies an off-axial point on an aspheric surface atwhich a tangential plane intersects the optical axis perpendicularly. “ATotal track length” is defined as a distance along the optical axis froman object-side surface of an optical element located closest to theobject to an image plane. “The total track length” and “a back focus” isa distance obtained when thickness of an IR cut filter or a cover glasswhich may be arranged between the imaging lens and the image plane isconverted into an air-converted distance.

An imaging lens according to the present invention comprises, in orderfrom an object side to an image side, a first lens having a convexsurface facing the object side near an optical axis, a second lens, athird lens, a fourth lens, a fifth lens, a sixth lens being adouble-sided aspheric lens, and a seventh lens having a concave surfacefacing the image side near the optical axis and having negativerefractive power, wherein an image-side surface of the seventh lens isformed as an aspheric surface having at least one pole point in aposition off the optical axis.

According to the imaging lens having the above-described configuration,the first lens properly corrects spherical aberration and distortion byhaving the convex surface facing the object side near the optical axis.The second lens properly corrects astigmatism and the distortion. Thethird lens properly corrects the spherical aberration, coma aberrationand chromatic aberration. The fourth lens properly corrects theastigmatism and the distortion. The fifth lens properly corrects theastigmatism, field curvature and the distortion. The sixth lens properlycorrects aberrations at a peripheral area by aspheric surfaces formed onboth side surfaces. The seventh lens secures back focus whilemaintaining low-profileness. An image-side surface of the seventh lensis a concave surface facing the image side near the optical axis, andthe field curvature and the distortion can be properly corrected and alight ray incident angle to an image sensor can be properly controlledby forming the aspheric surface having at least one pole point in aposition off the optical axis.

According to the imaging lens having the above-described configuration,it is preferable that the second lens has positive refractive power nearthe optical axis.

When the refractive power of the second lens is positive, a total tracklength can be shortened and the astigmatism can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that an image-side surface of the fourth lens has aconcave surface facing the image side near the optical axis.

When the image-side surface of the fourth lens has the concave surfacefacing the image side near the optical axis, the astigmatism and thedistortion can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that the fifth lens has the positive refractive powernear the optical axis.

When the refractive power of the fifth lens is positive, thelow-profileness is more facilitated.

According to the imaging lens having the above-described configuration,it is preferable that the sixth lens has plane surfaces both on theobject side and the image side near the optical axis.

When the sixth lens has the plane surfaces both on the object side andthe image side near the optical axis, aberrations at a peripheral areacan be properly corrected by the aspheric surfaces on both side surfaceswithout affecting refractive power of an overall optical system of theimaging lens.

According to the imaging lens having the above-described configuration,it is preferable that an object-side surface of the seventh lens has aconvex surface facing the object side near the optical axis.

When the object-side surface of the seventh lens has a convex surfacefacing the object side near the optical axis, the astigmatism and thefield curvature can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (1) is satisfied:

1.50<(D1/f1)×100<17.00  (1)

whereD1: a thickness along the optical axis of the first lens, andf1: a focal length of the first lens.

The conditional expression (1) defines an appropriate range of athickness along the optical axis of the first lens. When a value isbelow the upper limit of the conditional expression (1), the thicknessalong the optical axis of the first lens is suppressed from being toolarge, and an air gap of the image side of the first lens can be easilysecured. As a result, the low-profileness can be maintained. On theother hand, when the value is above the lower limit of the conditionalexpression (1), the thickness along the optical axis of the first lensis suppressed from being too small, and formability of the lens becomesexcellent.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (2) is satisfied:

0.02<T2/T4<0.10  (2)

whereT2: a distance along the optical axis from an image-side surface of thesecond lens to an object-side surface of the third lens, andT4: a distance along the optical axis from an image-side surface of thefourth lens to an object-side surface of the fifth lens.

The conditional expression (2) defines an appropriate range of adistance between the second lens and the third lens and a distancebetween the fourth lens and the fifth lens. By satisfying theconditional expression (2), difference of the distance between thesecond lens and the third lens and the distance between the fourth lensand the fifth lens is suppressed from being large, and thelow-profileness is achieved. Furthermore, by satisfying the conditionalexpression (2), the third lens and the fourth lens are arranged at anoptimum position, and aberration correction function of the lens becomesmore effective.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (3) is satisfied:

0.10<νd4/(νd5+νd6)<0.40  (3)

whereνd4: an abbe number at d-ray of the fourth lens,νd5: an abbe number at d-ray of the fifth lens, andνd6: an abbe number at d-ray of the sixth lens.

The conditional expression (3) defines an appropriate range of therespective abbe numbers at d-ray of the fourth lens, fifth lens andsixth lens. By satisfying the conditional expression (3), the chromaticaberration can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (4) is satisfied:

1.50<(D5/f5)×100<12.50  (4)

whereD5: a thickness along the optical axis of the fifth lens, andf5: a focal length of the fifth lens.

The conditional expression (4) defines an appropriate range of athickness along the optical axis of the fifth lens. When a value isbelow the upper limit of the conditional expression (4), the thicknessalong the optical axis of the fifth lens is suppressed from being toolarge, and air gaps of the object side and the image side of the fifthlens can be easily secured. As a result, the low-profileness can bemaintained. On the other hand, when the value is above the lower limitof the conditional expression (4), the thickness along the optical axisof the fifth lens is suppressed from being too small, and theformability of the lens becomes excellent.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (5) is satisfied:

0.20<(T2/TTL)×100<0.90  (5)

whereT2: a distance along the optical axis from an image-side surface of thesecond lens to an object-side surface of the third lens, andTTL: a total track length.

The conditional expression (5) defines an appropriate range of thedistance along the optical axis between the second lens and the thirdlens. By satisfying the conditional expression (5), the astigmatism andthe field curvature can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (6) is satisfied:

6.70<(T4/TTL)×100<15.00  (6)

whereT4: a distance along the optical axis from an image-side surface of thefourth lens to an object-side surface of the fifth lens, andTTL: a total track length.

The conditional expression (6) defines an appropriate range of thedistance along the optical axis between the fourth lens and the fifthlens. By satisfying the conditional expression (6), the distortion canbe properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (7) is satisfied:

2.00<f4/f<16.00  (7)

wheref4: a focal length of the fourth lens, andf: the focal length of the overall optical system of the imaging lens.

The conditional expression (7) defines an appropriate range ofrefractive power of the fourth lens.

When a value is below the upper limit of the conditional expression (7),positive refractive power of the fourth lens becomes appropriate and thelow-profileness can be achieved. On the other hand, when the value isabove the lower limit of the conditional expression (7), theastigmatism, the field curvature and the distortion can be properlycorrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (8) is satisfied:

0.50<f5/f<3.00  (8)

wheref5: a focal length of the fifth lens, andf: the focal length of the overall optical system of the imaging lens.

The conditional expression (8) defines an appropriate range ofrefractive power of the fifth lens. When a value is below the upperlimit of the conditional expression (8), positive refractive power ofthe fifth lens becomes appropriate and the low-profileness can beachieved. On the other hand, when the value is above the lower limit ofthe conditional expression (8), the astigmatism, the field curvature andthe distortion can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (9) is satisfied:

−1.40<f7/f<−0.40  (9)

wheref7: a focal length of the seventh lens, andf: the focal length of the overall optical system of the imaging lens.

The conditional expression (9) defines an appropriate range ofrefractive power of the seventh lens. When a value is below the upperlimit of the conditional expression (9), negative refractive power ofthe seventh lens becomes appropriate and it is favorable for thelow-profileness. On the other hand, when the value is above the lowerlimit of the conditional expression (9), the chromatic aberration, theastigmatism and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (10) is satisfied:

0.40<r7/f<1.90  (10)

wherer7: paraxial curvature radius of an object-side surface of the fourthlens, andf: the focal length of the overall optical system of the imaging lens.

The conditional expression (10) defines an appropriate range of theparaxial curvature radius of the object-side surface of the fourth lens.When a value is below the upper limit of the conditional expression(10), the coma aberration can be properly corrected. On the other hand,when the value is above the lower limit of the conditional expression(10), the astigmatism and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (11) is satisfied:

0.50<r8/f<2.60  (11)

wherer8: paraxial curvature radius of the image-side surface of the fourthlens, andf: the focal length of the overall optical system of the imaging lens.

The conditional expression (11) defines an appropriate range of theparaxial curvature radius of the image-side surface of the fourth lens.When a value is below the upper limit of the conditional expression(11), the astigmatism and the distortion can be properly corrected. Onthe other hand, when the value is above the lower limit of theconditional expression (11), the coma aberration can be properlycorrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (12) is satisfied:

−3.50<r9/f<−0.50  (12)

wherer9: paraxial curvature radius of an object-side surface of the fifthlens, andf: the focal length of the overall optical system of the imaging lens.

The conditional expression (12) defines an appropriate range of theparaxial curvature radius of the object-side surface of the fifth lens.When a value is below the upper limit of the conditional expression(12), the spherical aberration can be properly corrected. On the otherhand, when the value is above the lower limit of the conditionalexpression (12), the astigmatism, field curvature and the distortion canbe properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (13) is satisfied:

0.70<r13/f<6.50  (13)

wherer13: paraxial curvature radius of an object-side surface of the seventhlens, andf: the focal length of the overall optical system of the imaging lens.

The conditional expression (13) defines an appropriate range of theparaxial curvature radius of the object-side surface of the seventhlens. When a value is below the upper limit of the conditionalexpression (13), the field curvature can be properly corrected. On theother hand, when the value is above the lower limit of the conditionalexpression (13), the astigmatism and the distortion can be properlycorrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (14) is satisfied:

0.40<r6/r7<1.60  (14)

wherer6: paraxial curvature radius of an image-side surface of the thirdlens, andr7: paraxial curvature radius of an object-side surface of the fourthlens.

The conditional expression (14) defines relationship between paraxialcurvature radii of the image-side surface of the third lens and theobject-side surface of the fourth lens. By satisfying the conditionalexpression (14), refractive powers of the image-side surface of thethird lens and the object-side surface of the fourth lens are suppressedfrom being excessive. As a result, the coma aberration, the astigmatismand the distortion can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (15) is satisfied:

0.30<r7/r8<1.30  (15)

wherer7: paraxial curvature radius of an object-side surface of the fourthlens, andr8: paraxial curvature radius of an image-side surface of the fourthlens.

The conditional expression (15) defines relationship between paraxialcurvature radii of the object-side surface and the image-side surface ofthe fourth lens. By satisfying the conditional expression (15),refractive powers of the object-side surface and the image-side surfaceof the fourth lens are suppressed from being excessive. As a result, thecoma aberration, the astigmatism and the distortion can be properlycorrected. Furthermore, an effect of reducing sensitivity to amanufacturing error of the fourth lens can be obtained.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (16) is satisfied:

−1.90<r8/r9<−0.30  (16)

wherer8: paraxial curvature radius of an image-side surface of the fourthlens, andr9: paraxial curvature radius of an object-side surface of the fifthlens.

The conditional expression (16) defines relationship between paraxialcurvature radii of the image-side surface of the fourth lens and theobject-side surface of the fifth lens. By satisfying the conditionalexpression (16), refractive powers of the image-side surface of thefourth lens and the object-side surface of the fifth lens are suppressedfrom being excessive. As a result, the coma aberration, the astigmatismand the distortion can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (17) is satisfied:

0.15<νd6/νd7<0.55  (17)

whereνd6: an abbe number at d-ray of the sixth lens, andνd7: an abbe number at d-ray of the seventh lens.

The conditional expression (17) defines an appropriate range of therespective abbe numbers at d-ray of the sixth lens and the seventh lens.By satisfying the conditional expression (17), the chromatic aberrationcan be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (18) is satisfied:

2.10<T1/T2<8.30  (18)

whereT1: a distance along the optical axis from an image-side surface of thefirst lens to an object-side surface of the second lens, andT2: a distance along the optical axis from an image-side surface of thesecond lens to an object-side surface of the third lens.

The conditional expression (18) defines an appropriate range of adistance between the first lens and the second lens and a distancebetween the second lens and the third lens. By satisfying theconditional expression (18), difference of the distance between thefirst lens and the second lens and the distance between the second lensand the third lens is suppressed from being large, and thelow-profileness is achieved. Furthermore, by satisfying the conditionalexpression (18), the second lens are arranged at an optimum position,and aberration correction function of the lens becomes more effective.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (19) is satisfied:

1.20<1f5/f71<3.40  (19)

wheref5: a focal length of the fifth lens, andf7: a focal length of the seventh lens.

The conditional expression (19) defines an appropriate range ofrefractive powers of the fifth lens and the seventh lens. By satisfyingthe conditional expression (19), the coma aberration, the astigmatismand the distortion can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that composite refractive power of the sixth lens andthe seventh lens is negative, and more preferable that a belowconditional expression (20) is satisfied:

−1.35<f67/f<−0.40  (20)

wheref67: a composite focal length of the sixth lens and the seventh lens,andf: the focal length of the overall optical system of the imaging lens.

When the composite refractive power of the sixth lens and the seventhlens is negative, it is favorable for correction of the chromaticaberration. The conditional expression (20) defines an appropriate rangeof the composite refractive power of the sixth lens and the seventhlens. When a value is below the upper limit of the conditionalexpression (20), the negative composite refractive power of the sixthlens and the seventh lens becomes appropriate, and the low-profilenesscan be achieved. On the other hand, when the value is above the lowerlimit of the conditional expression (20), the astigmatism, the fieldcurvature and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration,it is preferable that a below conditional expression (21) is satisfied:

−1.00<r10/f<−0.20  (21)

wherer10: paraxial curvature radius of an image-side surface of the fifthlens, andf: the focal length of the overall optical system of the imaging lens.

The conditional expression (21) defines an appropriate range of theparaxial curvature radius of the image-side surface of the fifth lens.By satisfying the conditional expression (21), the coma aberration, theastigmatism, the field curvature and the distortion can be properlycorrected.

Effect of Invention

According to the present invention, there can be provided an imaginglens with high resolution which satisfies demand of the wide field ofview, the low-profileness and the low F-number in well balance, andproperly corrects aberrations.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing an imaging lens in Example 1according to the present invention;

FIG. 2 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 1 according to the present invention;

FIG. 3 is a schematic view showing an imaging lens in Example 2according to the present invention;

FIG. 4 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 2 according to the present invention;

FIG. 5 is a schematic view showing an imaging lens in Example 3according to the present invention;

FIG. 6 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 3 according to the present invention;

FIG. 7 is a schematic view showing an imaging lens in Example 4according to the present invention;

FIG. 8 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 4 according to the present invention;

FIG. 9 is a schematic view showing an imaging lens in Example 5according to the present invention;

FIG. 10 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 5 according to the present invention;

FIG. 11 is a schematic view showing an imaging lens in Example 6according to the present invention;

FIG. 12 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 6 according to the present invention;

FIG. 13 is a schematic view showing an imaging lens in Example 7according to the present invention;

FIG. 14 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 7 according to the present invention;

FIG. 15 is a schematic view showing an imaging lens in Example 8according to the present invention;

FIG. 16 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 8 according to the present invention;

FIG. 17 is a schematic view showing an imaging lens in Example 9according to the present invention;

FIG. 18 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 9 according to the present invention;

FIG. 19 is a schematic view showing an imaging lens in Example 10according to the present invention;

FIG. 20 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 10 according to the present invention;

FIG. 21 is a schematic view showing an imaging lens in Example 11according to the present invention; and

FIG. 22 shows spherical aberration, astigmatism, and distortion of theimaging lens in Example 11 according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Hereinafter, the preferred embodiments of the present invention will bedescribed in detail referring to the accompanying drawings.

FIGS. 1, 3, 5, 7, 9, 11, 13, 15, 17, 19 and 21 are schematic views ofthe imaging lenses in Examples 1 to 11 according to the embodiments ofthe present invention, respectively.

As shown in FIG. 1, the imaging lens according to the present embodimentcomprises in order from an object side to an image side, a first lens L1having a convex surface facing the object side near an optical axis Xand having positive refractive power, a second lens L2, a third lens L3,a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lensL7 having a concave surface facing the image side near the optical axisX and having negative refractive power. An image-side surface of theseventh lens L7 is formed as an aspheric surface having at least onepole point in a position off the optical axis X.

A filter IR such as an IR cut filter and a cover glass are arrangedbetween the seventh lens L7 and an image plane IMG (namely, the imageplane of an image sensor). The filter IR is omissible.

By arranging an aperture stop ST on the object side of the first lensL1, correction of aberrations and control of an incident angle of thelight ray of high image height to the image sensor become facilitated.

The first lens L1 has a meniscus shape having a convex surface facingthe object side and a concave surface facing the image side near theoptical axis X. Therefore, spherical aberration, astigmatism anddistortion can be properly corrected.

The second lens L2 has positive refractive power and has a biconvexshape having convex surfaces facing the object side and the image sidenear the optical axis X. Therefore, the astigmatism and the distortioncan be properly corrected. Furthermore, the biconvex shape suppressescurvature from being large, and effectively reduces sensitivity to amanufacturing error. A shape of the second lens L2 may be a meniscusshape having the convex surface facing the object side and the concavesurface facing the image side near the optical axis X as in the Examples4, 5, 6, 7, 8 and 9 shown in FIGS. 7, 9, 11, 13, 15 and 17. In thiscase, the spherical aberration, the astigmatism and field curvature andthe distortion can be properly corrected.

The third lens L3 has negative refractive power and has a biconcaveshape having concave surfaces facing the object side and the image sidenear the optical axis X. Therefore, the spherical aberration, comaaberration and chromatic aberration can be properly corrected.Furthermore, the biconcave shape suppresses curvature from being large,and reduces sensitivity to a manufacturing error. A shape of the thirdlens L3 may be a meniscus shape having the convex surface facing theobject side and the concave surface facing the image side near theoptical axis X as in the Examples 3 to 11 shown in FIGS. 5, 7, 9, 11,13, 15, 17, 19 and 21. In this case, the astigmatism, the fieldcurvature and the distortion can be properly corrected.

The fourth lens L4 has positive refractive power and has a meniscusshape having a convex surface facing the object side and a concavesurface facing the image side near the optical axis X. Therefore, thecoma aberration, the astigmatism and the distortion can be properlycorrected.

The fifth lens L5 has positive refractive power and has a meniscus shapehaving a convex surface facing the object side and a concave surfacefacing the image side near the optical axis X. Therefore, a light rayincident angle to the fifth lens L5 becomes appropriate, and theastigmatism, the field curvature and the distortion can be properlycorrected.

The sixth lens L6 has plane surfaces both on the object side and theimage side near the optical axis X, and substantially has no refractivepower near the optical axis X. Therefore, aberrations at a peripheralarea can be properly corrected by the aspheric surfaces on both sideswithout affecting refractive power of an overall optical system of theimaging lens.

The seventh lens L7 has negative refractive power and has a meniscusshape having a convex surface facing the object side and a concavesurface facing the image side near the optical axis X. Therefore, a backfocus can be secured while maintaining the low-profileness, and thechromatic aberration, the astigmatism, the field curvature and thedistortion can be properly corrected.

The image-side surface of the seventh lens L7 is formed as an asphericsurface having at least one pole point in a position off the opticalaxis X. Therefore, the field curvature and the distortion can beproperly corrected and the light ray incident angle to the image sensoris appropriately controlled.

Regarding the imaging lens according to the present embodiments, it ispreferable that all lenses of the first lens L1 to the seventh lens L7are single lenses. Configuration only with the single lenses canfrequently use the aspheric surfaces. In the present embodiments, alllens surfaces are formed as appropriate aspheric surfaces, and theaberrations are favorably corrected. Furthermore, in comparison with thecase in which a cemented lens is used, workload is reduced, andmanufacturing in low cost becomes possible.

Furthermore, the imaging lens according to the present embodiments makesmanufacturing facilitated by using plastic material for all of thelenses, and mass production in a low cost can be realized.

The material applied to the lens is not limited to the plastic material.By using glass material, further high performance may be aimed. It ispreferable that all of lens-surfaces are formed as aspheric surfaces,however, spherical surfaces easy to be manufactured may be adopted inaccordance with required performance.

The imaging lens according to the present embodiments shows preferableeffect by satisfying the below conditional expressions (1) to (21).

1.50<(D1/f1)×100<17.00  (1)

0.02<T2/T4<0.10  (2)

0.10<νd4/(νd5+νd6)<0.40  (3)

1.50<(D5/f5)×100<12.50  (4)

0.20<(T2/TTL)×100<0.90  (5)

6.70<(T4/TTL)×100<15.00  (6)

2.00<f4/f<16.00  (7)

0.50<f5/f<3.00  (8)

−1.40<f7/f<−0.40  (9)

0.40<r7/f<1.90  (10)

0.50<r8/f<2.60  (11)

−3.50<r9/f<−0.50  (12)

0.70<r13/f<6.50  (13)

0.40<r6/r7<1.60  (14)

0.30<r7/r8<1.30  (15)

−1.90<r8/r9<−0.30  (16)

0.15<νd6/νd7<0.55  (17)

2.10<T1/T2<8.30  (18)

1.20<|f5/f7|<3.40  (19)

−1.35<f67/f<−0.40  (20)

−1.00<r10/f<−0.20  (21)

whereνd4: an abbe number at d-ray of the fourth lens L4,νd5: an abbe number at d-ray of the fifth lens L5,νd6: an abbe number at d-ray of the sixth lens L6,νd7: an abbe number at d-ray of the seventh lens L7,D1: a thickness along the optical axis X of the first lens L1,D5: a thickness along the optical axis X of the fifth lens L5,T1: a distance along the optical axis X from an image-side surface ofthe first lens L1 to an object-side surface of the second lens L2,T2: a distance along the optical axis X from an image-side surface ofthe second lens L2 to an object-side surface of the third lens L3,T4: a distance along the optical axis X from an image-side surface ofthe fourth lens L4 to an object-side surface of the fifth lens L5,TTL: a total track length,f: the focal length of the overall optical system of the imaging lens,f1: a focal length of the first lens L1,f4: a focal length of the fourth lens L4,f5: a focal length of the fifth lens L5,f7: a focal length of the seventh lens L7,f67: a composite focal length of the sixth lens L6 and the seventh lensL7,r6: paraxial curvature radius of an image-side surface of the third lensL3,r7: paraxial curvature radius of an object-side surface of the fourthlens L4,r8: paraxial curvature radius of the image-side surface of the fourthlens L4,r9: paraxial curvature radius of an object-side surface of the fifthlens L5,r10: paraxial curvature radius of an image-side surface of the fifthlens L5, andr13: paraxial curvature radius of an object-side surface of the seventhlens L7.

It is not necessary to satisfy the above all conditional expressions,and by satisfying the conditional expression individually, operationaladvantage corresponding to each conditional expression can be obtained.

The imaging lens according to the present embodiments shows furtherpreferable effect by satisfying the below conditional expressions (1a)to (21a).

3.00<(D1/f1)×100<13.50  (1a)

0.04<T2/T4<0.08  (2a)

0.20<νd4/(νd5+νd6)<0.35  (3a)

2.80<(D5/f5)×100<10.50  (4a)

0.40<(T2/TTL)×100<0.75  (5a)

7.50<(T4/TTL)×100<12.50  (6a)

3.50<f4/f<13.00  (7a)

0.90<f5/f<2.50  (8a)

−1.10<f7/f<−0.60  (9a)

0.60<r7/f<1.50  (10a)

0.75<r8/f<2.10  (11a)

−2.90<r9/f<−0.80  (12a)

1.10<r13/f<5.20  (13a)

0.60<r6/r7<1.30  (14a)

0.50<r7/r8<1.10  (15a)

−1.50<r8/r9<−0.50  (16a)

0.25<νd6/νd7<0.45  (17a)

2.35<T1/T2<6.90  (18a)

1.40<|f5/f7|<2.80  (19a)

−1.10<f67/f<−0.60  (20a)

−0.85<r10/f<−0.30  (21a)

The signs in the above conditional expressions have the same meanings asthose in the paragraph before the preceding paragraph.

In this embodiment, the aspheric shapes of the surfaces of the asphericlens are expressed by Equation 1, where Z denotes an axis in the opticalaxis direction, H denotes a height perpendicular to the optical axis, Rdenotes a paraxial curvature radius, k denotes a conic constant, and A4,A6, A8, A10, A12, A14, A16, A18 and A20 denote aspheric surfacecoefficients.

$\begin{matrix}{Z = {\frac{\frac{H^{2}}{R}}{1 + \sqrt{1 - {\left( {k + 1} \right)\frac{H^{2}}{R^{2}}}}} + {A_{4}H^{4}} + {A_{6}H^{6}} + {A_{8}H^{8}} + {A_{10}H^{10}} + {A_{12}H^{12}} + {A_{14}H^{14}} + {A_{16}H^{16}} + {A_{18}H^{18}} + {A_{20}H^{20}}}} & {{Equation}\mspace{14mu} 1}\end{matrix}$

Next, examples of the imaging lens according to this embodiment will beexplained. In each example, f denotes the focal length of the overalloptical system of the imaging lens, Fno denotes a F-number, w denotes ahalf field of view, ih denotes a maximum image height, and TTL denotes atotal track length. Additionally, i denotes surface number counted fromthe object side, r denotes paraxial curvature radius, d denotes thedistance of lenses along the optical axis (surface distance), Nd denotesa refractive index at d-ray (reference wavelength), and νd denotes anabbe number at d-ray. As for aspheric surfaces, an asterisk (*) is addedafter surface number i.

Example 1

The basic lens data is shown below in Table 1.

TABLE 1 Example 1 Unit mm f = 4.69

 = 3.93

 = 1.50 TTL = 5.58 ω(*) = 39.4 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.3204 2* 2.0736 0.5200 1.544 55.88(v d1) 3* 2.9209 0.1037 4* 2.8004 0.7583 1.544 55.86 (v d2) 5* -68.81890.0300 6* -44.9876 0.2200 1.861 20.37 (v d3) 7* 5.3647 0.3910 8* 5.15860.3187 1.681 20.37 (v d4) 9* 6.8870 0.4725 10* -8.2857 0.4116 1.53585.66 (v d5) 11* -2.5130 0.0451 12* Infinity 0.4500 1.681 20.37 (v d6)13* Infinity 0.3023 14* 17.3547 0.5021 1.535 65.66 (v d7) 15* 1.85860.3000 18 Infinity 0.2100 1.517 04.20 19 Infinity 0.5740 Image PlansInfinity Constituent Lens Data Start Focal Lens Surface Length CompositeFocal Length 1 2 10.798 167 -3.936 2 4 4.952 3 6 -7.241 4 8 28.907 5 106.501 6 12 Infinity 7 14 -3.935 Aspheric Surface Data Second ThirdFourth Fifth Surface Surface Surface Surface k -9.439083E-01-1.909210E+01 -1.381746E+01 0.000000E+00 A4 -1.379402E-02 2.780187E-022.815085E-02 -7.557235E-02 A6 4.083157E-02 -1.242574E-01 -7.580091E-021.646999E-01 A8 -1.284806E-01 9.045892E-02 2.327709E-02 -2.197758E-01A10 1.897405E-01 -2.172419E-02 4.635845E-02 1.307767E-01 A12-1.690335E-01 -1.236798E-02 -4.054293E-02 -1.913417E-02 A14 8.203016E-021.415821E-02 1.623150E-02 -1.443400E-02 A16 -2.080476E-02 -5.307864E-03-2.999538E-03 6.762534E-03 A18 2.158704E-03 7.118242E-04 4.582413E-04-8.813024E-04 A20 Sixth Seventh Eighth Ninth Surface Surface SurfaceSurface k 0.000000E+00 2.159540E-01 2.492904E-02 -8.654383E-02 A4-6.948367E-02 -0.019504E-02 -6.983828E-02 -7.692711E-02 A6 1.917854E-011.822452E-01 4.044098E-02 2.000825E-02 A8 -1.758249E-01 -3.668261E-01-7.370459E-02 -5.488519E-02 A10 -2.461374E-02 5.617164E-01 9.418333E-025.480036E-02 A12 1.488236E-01 -6.125976E-01 -7.075745E-02 -2.851110E-02A14 -1.038165E-01 4.232679E-01 2.469440E-02 5.842455E-03 A163.110768E-02 -1.610884E-01 -3.000100E-03 0.000000E+00 A18 -0.549301E-032.587853E-02 0.000000E+00 0.000000E+00 A20 Tenth Eleventh TwelfthThirteenth Surface Surface Surface Surface k 3.431773E-00 -7.250828E-000.000000E+00 0.000000E+00 A4 -2.187381E-02 -1.258301E-02 7.105337E-026.528861E-02 A6 8.830782E-02 1.286181E-01 -4.944210E-02 -7.442498E-02 A8-1.257058E-01 -2.171890E-01 4.248131E-02 2.372703E-02 A10 5.472606E-021.480038E-01 4.229265E-02 -3.458269E-03 A12 -3.696223E-03 -5.074091E-02-1.472493E-02 2.214094E-04 A14 -4.163554E-03 8.748518E-03 2.413440E-03-3.871388E-08 A16 9.040915E-04 -6.057718E-04 -1.581382E-04 0.000000E+00A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+000.000000E+00 0.000000E+00 0.000000E-00 Fourteenth Fifteenth SurfaceSurface k 4.167108E+00 -8.349802E+00 A4 -1.379519E-01 -7.796892E-02 A62.354940E-02 2.400230E-02 A8 5.624410E-03 -5.298375E-00 A10-2.531808E-03 8.982362E-04 A12 3.729891E-04 -1.145012E-04 A14-2.544367E-05 8.672992E-06 A16 6.758603E-07 -2.703170E-07 A180.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 1 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 2 shows spherical aberration (mm), astigmatism (mm), and distortion(%) of the imaging lens in Example 1. The spherical aberration diagramshows the amount of aberration at wavelengths of F-ray (486 nm), d-ray(588 nm), and C-ray (656 nm). The astigmatism diagram shows the amountof aberration at d-ray on a sagittal image surface S (solid line) and ontangential image surface T (broken line), respectively (same as FIGS. 4,6, 8, 10, 12, 14, 16, 18, 20 and 22). As shown in FIG. 2, eachaberration is corrected excellently.

Example 2

The basic lens data is shown below in Table 2.

TABLE 2 Example 2 Unit mm f = 4.70

 = 3.93

 = 1.60 TTL = 5.53 ω(*) = 39.4 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.3204 2* 2.0874 0.5045 1.546 55.88(v d1) 3* 2.0374 0.1130 4* 2.8071 0.7373 1.544 55.86 (v d2) 5* -52.68400.0300 6* -50.9000 0.2200 1.861 20.37 (v d3) 7* 8.0627 0.4047 8* 5.28320.3178 1.861 20.37 (v d4) 9* 7.1213 0.4798 10* -8.2952 0.4207 1.53565.86 (v d5) 11* -2.4892 0.0418 12* Infinity 0.4500 1.661 20.27 (v d6)13* Infinity 0.3023 14* 10.1625 0.8019 1.535 55.66 (v d7) 15* 1.83830.3000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.5700 Image PlansInfinity Constituent Lens Data Start Focal Lens Surface Length CompositeFocal Length 1 2 10.843 167 -3.842 2 4 4.919 3 6 -7.085 4 8 28.085 5 105.485 6 12 Infinity 7 14 -3.842 Aspheric Surface Data Second ThirdFourth Fifth Surface Surface Surface Surface k -8.680707E-01-1.000178E+01 -1.365274E+01 0.000000E+00 A4 -7.200435E-03 2.589394E-023.034051E-02 -5.000264E-02 A6 1.162181E-02 -1.254835E-01 -9.905854E-029.877413E-02 A8 -6.548781E-02 1.186074E-01 9.345235E-02 -1.269774E-01A10 1.078278E-01 -7.019281E-02 -5.912249E-02 8.203502E-02 A12-1.031794E-01 3.174137E-02 5.038425E-02 -2.374724E-02 A14 5.352817E-02-8.775957E-03 -2.933541E-02 1.564758E-03 A16 -1.391757E-02 1.113831E-038.331981E-03 4.244397E-04 A18 1.427651E-03 -3.726743E-05 -9.333881E-04-4.388357E-05 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00Sixth Seventh Eighth Ninth Surface Surface Surface Surface k0.000000E+00 2.105741E-01 3.161392E-02 -9.231780E-02 A4 -5.513434E-02-2.817035E-02 -9.753022E-02 -8.011050E-02 A6 1.498392E-01 1.386548E-018.590067E-02 3.530010E-02 A8 -1.565356E-01 -2.451886E-01 -1.286250E-01-6.895453E-02 A10 4.369018E-02 3.568439E-01 1.523507E-01 8.544628E-02A12 3.195554E-02 -3.877882E-01 -1.051331E-01 -3.211871E-02 A14-2.455459E-02 2.888878E-01 3.671528E-02 6.270757E-03 A16 5.564787E-03-1.150603E-01 -5.008132E-06 0.000000E+00 A18 -3.112535E-04 1.954657E-020.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+000.000000E+00 Tenth Eleventh Twelfth Thirteenth Surface Surface SurfaceSurface k 3.426334E+00 -7.236585E+00 0.000000E+00 0.000000E+00 A4-2.058506E-02 -5.083138E-03 7.081788E-02 6.857840E-02 A6 9.768552E-021.215270E-01 -4.643905E-02 -7.870465E-02 A8 -1.249977E-01 -2.025405E-01-4.578530E-02 2.562325E-02 A10 6.410417E-02 1.338222E-01 4.378388E-02-3.921524E-03 A12 -4.244888E-03 -4.455736E-02 -1.504480E-02 2.827886E-04A14 -3.649255E-03 7.504718E-03 2.448059E-03 -7.171536E-06 A168.085585E-04 -5.111007E-04 -1.567757E=04 0.000000E+00 A18 0.000000E+000.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+000.000000E+00 0.000000E-00 Fourteenth Fifteenth Surface Surface k4.150653E+00 -0.034058E+00 A4 -1.389258E-01 -8.095648E-02 A62.701870E-02 2.585246E-02 A8 3.247334E-03 -5.743295E-03 A10-1.828925E-03 9.456667E-04 A12 2.687084E-04 -1.152405E-04 A14-1.776331E-.05 8.421342E-06 A16 4.520186E-07 -2.558774E-07 A180.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 2 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 4 shows spherical aberration (mm), astigmatism (mm), and distortion(%) of the imaging lens in Example 2. As shown in FIG. 4, eachaberration is corrected excellently.

Example 3

The basic lens data is shown below in Table 3.

TABLE 3 Example 3 Unit mm f = 4.75

 = 3.83

 = 1.60 TTL = 5.53 ω(*) = 39.1 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.3728 2* 2.0895 0.5133 1.544 55.86(v d1) 3* 3.3582 0.1434 4* 3.0780 0.6514 1.544 55.86 (v d2) 5* -71.53470.0324 6* 241.8758 0.2200 1.681 20.37 (v d3) 7* 4.5000 0.4260 8* 5.60590.8118 1.681 20.37 (v d4) 9* 7.5650 0.4923 10* -8.6613 0.4232 1.53556.66 (v d5) 11* -2.6257 0.0316 12* Infinity 0.4500 1.661 20.37 (v d6)13* Infinity 0.3232 14* 15.3104 0.5000 1.535 55.66 (v d7) 15* 1.81200.3000 18 Infinity 0.2100 1.517 04.20 19 Infinity 0.5700 Image PlansInfinity Constituent Lens Data Start Focal Lens Surface Length CompositeFocal Length 1 2 8.800 187 -3.885 2 4 5.435 3 6 -6.942 4 8 30.910 5 106.801 6 12 Infinity 7 14 -3.895 Aspheric Surface Data Second ThirdFourth Fifth Surface Surface Surface Surface k -9.434785E-01-1.933237E-01 -1.262389E+01 0.000000E+00 A4 -1.001367E-02 6.440275E-031.478432E-02 -4.969667E-02 A6 3.034898E-02 -8.213868E-02 -3.683202E-02-3.401601E-03 A8 -1.048240E-01 7.033553E-02 1.256776E-01 1.565348E-01A10 1.567821E-01 -2.388811E-02 -1.248753E-01 -3.143828E-01 A12-1.388508E-01 -6.218423E-02 1.080923E-01 2.831146E-01 A14 6.921510E-021.071258E-02 -5.952143E-02 -1.401130E-01 A16 -1.777888E-02 -4.034217E-031.744470E-02 3.543170E-02 A18 1.813881E-03 4.930967E-04 -2.133891E-03-3.718537E-03 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00Sixth Seventh Eighth Ninth Surface Surface Surface Surface k0.000000E+00 2.241614E-01 8.552513E-01 -1.034138E-01 A4 -4.509505E-02-3.000095E-02 -9.933715E-02 -8.893441E-02 A6 8.456708E-02 1.479583E-018.768337E-02 7.161850E-02 A8 8.334343E-02 -2.878932E-01 -2.094179E-01-1.651191E-01 A10 -2.923840E-01 4.403523E-01 3.020337E-01 1.056832E-01A12 2.933850E-01 -4.930071E-01 -2.447000E-01 -1.262305E-01 A14-1.395110E-01 3.545269E-01 1.017699E-01 4.197480E-02 A16 3.236285E-02-1.407358E-01 -1.692173E-02 -5.479198E-03 A18 -2.884823E-03 2.364030E-020.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+000.000000E+00 Tenth Eleventh Twelfth Thirteenth Surface Surface SurfaceSurface k 3.394603E+00 -6.078759E+00 0.000000E+00 0.000000E+00 A4-2.024279E-02 1.827193E-02 7.145853E-02 6.432511E-02 A6 1.137753E-011.144877E-01 -4.501340E-02 -8.124917E-02 A8 -1.571283E-01 -2.196053E-01-5.846686E-02 2.954763E-02 A10 9.388784E-02 1.487488E-01 5.679771E-02-5.361880E-03 A12 -2.308781E-02 -4.960324E-02 -2.020163E-02 4.983830E-04A14 1.655025E-03 8.276478E-08 3.347438E-03 -1.883239E-05 A161.849862E-04 -5.542113E-04 -2.148888E-04 0.000000E+00 A18 0.000000E+000.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+000.000000E+00 0.000000E-00 Fourteenth Fifteenth Surface Surface k4.150053E+00 -8.353364E+00 A4 -1.448534E-01 -8.162864E-02 A63.544736E-02 2.746317E-02 A8 -1.398683E-03 -6.541535E-03 A10-6.460325E-04 1.113813E-03 A12 1.132858E-04 -1.310477E-04 A14-7.460089E-06 8.967279E-05 A16 1.788885E-07 -2.557794E-07 A180.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 3 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 6 shows spherical aberration (mm), astigmatism (mm), and distortion(%) of the imaging lens in Example 3. As shown in FIG. 6, eachaberration is corrected excellently.

Example 4

The basic lens data is shown below in Table 4.

TABLE 4 Example 4 Unit mm f = 4.78

 = 3.93

 = 1.60 TTL = 5.53 ω(*) = 39.1 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.3802 2* 2.0000 0.5128 1.544 55.88(v d1) 3* 2.9904 0.1150 4* 2.8617 0.6318 1.544 55.86 (v d2) 5* 30.85960.0300 6* 10.5156 0.2200 1.871 19.48 (v d3) 7* 4.3394 0.4403 8* 4.85060.2813 1.671 19.48 (v d4) 9* 6.0814 0.5173 10* -0.1750 0.5005 1.82585.66 (v d5) 11* -2.2018 0.0314 12* Infinity 0.4945 1.671 19.48 (v d6)13* Infinity 0.1848 14* 8.2157 0.4878 1.535 85.66 (v d7) 15* 1.80070.3000 18 Infinity 0.2100 1.517 04.20 19 Infinity 0.6801 Image PlansInfinity Constituent Lens Data Start Focal Lens Surface Length CompositeFocal Length 1 2 8.383 167 -3.815 2 4 5.748 3 6 -8.495 4 8 32.685 5 106.126 6 12 Infinity 7 14 -3.815 Aspheric Surface Data Second ThirdFourth Fifth Surface Surface Surface Surface k -9.786850E-01-1.935882E+01 -1.123860E+01 0.000000E+00 A4 -1.192969E-02 1.858313E-026.420185E-03 -1.310087E-01 A6 3.885475E-02 -1.117583E-01 -6.335213E-022.720859E-01 A8 -1.195738E-01 1.265826E-01 1.491710E-01 -3.180568E-01A10 1.786653E-01 -8.627340E-02 -1.763402E-01 2.144920E-01 A12-1.578929E-01 5.292456E-02 1.861290E-01 -1.029006E-01 A14 7.981613E-021.761868E-02 -6.593470E-02 4.324201E-02 A16 -2.101411E-02 2.972028E-032.935732E-02 -1.331421E-02 A18 2.241575E-03 1.911757E-04 -3.724697E-031.804316E-03 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00Sixth Seventh Eighth Ninth Surface Surface Surface Surface k0.000000E+00 9.708958E-01 -5.845981E-01 -1.723744E-01 A4 -1.125780E-01-2.087413E-02 -4.008570E-01 -9.305216E-02 A6 2.994328E-01 1.493992E-011.122993E-01 1.140507E-01 A8 -3.353825E-01 -2.873687E-01 -3.018065E-01-2.756126E-01 A10 1.909099E-01 4.406111E-01 4.373752E-01 3.332573E-01A12 -7.322507E-02 -4.925013E-01 -3.569546E-01 -2.251020E-01 A143.314340E-02 3.546457E-01 1.514429E-01 7.967676E-02 A16 -1.697107E-02-1.407541E-01 -2.548009E-02 -1.118958E-02 A18 2.943707E-03 2.369853E-020.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+000.000000E+00 Tenth Eleventh Twelfth Thirteenth Surface Surface SurfaceSurface k 3.394548E+00 -5.484798E+00 0.000000E+00 0.000000E+00 A4-1.430894E-02 -1.001347E-02 7.468289E-02 7.868812E-02 A6 8.042982E-028.967556E-02 -7.903925E-02 -1.133632E-01 A8 -1.145358E-01 -1.090545E-01-1.380549E-02 5.093735E-02 A10 5.712912E-02 7.075842E-02 3.162618E-02-1.167611E-02 A12 -1.408223E-02 -2.268863E-02 -1.269857E-02 1.354466E-03A14 1.417493E-03 3.561878E-03 2.259801E-03 -6.231025E-05 A161.257430E-05 -2.199000E-04 -1.484958E-04 0.000000E+00 A18 0.000000E+000.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+000.000000E+00 0.000000E-00 Fourteenth Fifteenth Surface Surface k3.952089E+00 -8.449574E+00 A4 -2.149192E-01 -1.114224E-01 A69.596561E-02 5.380307E-02 A8 -2.306028E-02 -1.658395E-02 A103.380942E-03 2.715695E-03 A12 -3.010188E-04 -2.846377E-04 A141.500206E-05 1.649876E-05 A16 -3.237248E-07 -4.028800E-07 A180.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 4 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 8 shows spherical aberration (mm), astigmatism (mm), and distortion(%) of the imaging lens in Example 4. As shown in FIG. 8, eachaberration is corrected excellently.

Example 5

The basic lens data is shown below in Table 5.

TABLE 5 Example 5 Unit mm f = 4.78

 = 3.93

 = 1.50 TTL = 5.53 ω(*) = 30.0 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.3958 2* 2.0544 0.5289 1.544 55.88(v d1) 3* 3.1312 0.1106 4* 2.7939 0.8978 1.544 55.86 (v d2) 5* 28.02940.0330 6* 18.3850 0.2200 1.871 16.48 (v d3) 7* 4.1490 0.3872 8* 5.24730.2965 1.671 19.46 (v d4) 9* 7.0627 0.5131 10* -5.7185 0.4508 1.53555.66 (v d5) 11* -2.2921 0.0478 12* Infinity 0.4546 1.671 19.48 (v d6)13* Infinity 0.1876 14* 8.3838 0.4881 1.535 55.66 (v d7) 15* 1.67200.3000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.6807 Image PlansInfinity Constituent Lens Data Start Focal Lens Surface Length CompositeFocal Length 1 2 9.356 167 -4.008 2 4 5.846 3 6 -8.031 4 8 2.8531 5 106.839 6 12 Infinity 7 14 -4.008 Aspheric Surface Data Second ThirdFourth Fifth Surface Surface Surface Surface k -9.311808E-01-2.004452E+01 -1.057112E+01 0.000000E+00 A4 -1.043291E-02 1.238831E-03-8.845780E-03 -9.385266E-02 A6 1.760371E-02 -7.350352E-02 1.083043E-032.926406E-02 A8 -6.195434E-02 5.793896E-02 -7.314596E-02 1.587054E-01A10 8.610647E-02 2.537184E-03 1.812186E-01 -4.482735E-01 A127.314912E-02 -3.107975E-02 -1.897035E-01 4.4373678-01 A14 3.526153E-022.194558E-02 8.297180E-02 -2.197256E-01 A16 -8.731876E-03 -6.481702E-03-2.100862E-02 5.453989E-02 A18 8.605784E-04 7.830071E-04 2.104444E-03-5.420723E-03 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00Sixth Seventh Eighth Ninth Surface Surface Surface Surface k0.000000E+00 1.050403E+00 8.684539E-01 -1.760353E-01 A4 -8.045074E-02-3.033634E-02 -1.023699E-01 -6.975278E-02 A6 1.303157E-01 1.518297E-011.189053E-01 1.089459E-01 A8 9.301032E-02 -2.867581E-01 -3.363288E-01-2.698296E-01 A10 -4.181145E-01 4.400089E-01 5.239835E-01 3.376063E-01A12 4.374108E-01 -4.932727E-01 -4.518869E-01 -2.173344E-01 A14-2.119925E-01 3.551165E-01 2.113834E-01 8.748528E-02 A16 4.863138E-02-1.410168E-01 -3.880001E-02 -1.277000E-02 A18 -4.036541E-03 2.389119E-020.000000E+00 0.000000E-00 A20 0.000000E+00 0.000000E+00 0.000000E+00Tenth Eleventh Twelfth Thirteenth Surface Surface Surface Surface k2.431820E+00 -5.02702E+00 0.000000E+00 0.000000E+00 A4 -1.177294E-035.563313E-04 5.803432E-02 4.167721E-02 A6 6.821306E-02 4.120378E-02-7.511613E-02 -6.755624E-02 A8 -1.023216E-01 -7.050317E-02 0.001608E-032.652477E-02 A10 6.011750E-02 4.427337E-02 7.188733E-03 -5.476707E-03A12 -2.090785E-02 -1.314158E-02 -3.052976E-03 6.147675E-04 A144.062427E-03 1.817732E-02 5.088364E-04 -2.885454E-05 A16 -3.075104E-04-9.130498E-05 -3.304348E-05 0.000000E+00 A18 0.000000E+00 0.000000E+000.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+000.000000E-00 Fourteenth Fifteenth Surface Surface k 5.020961E+00-8.793187E+00 A4 -2.218884E-01 1.034744E-01 A6 1.020760E-01 4.549483E-02A8 -2.507987E-02 -1.233487E-02 A10 3.778383E-03 2.086271E-03 A120.514367E-04 -2.197373E-04 A14 1.873152E-05 1.318010E-05 A16-4.436525E-07 -3.309278E-07 A18 0.000000E+00 0.000000E+00 A200.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 5 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 10 shows spherical aberration (mm), astigmatism (mm), anddistortion (%) of the imaging lens in Example 5. As shown in FIG. 10,each aberration is corrected excellently.

Example 6

The basic lens data is shown below in Table 6.

TABLE 6 Example 6 Unit mm f = 4.75

 = 3.93

 = 1.50 TTL = 5.53 ω(*) = 39.1 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.3906 2* 2.0490 0.5105 1.544 55.88(v d1) 3* 2.5416 0.1004 4* 2.3801 0.7135 1.544 55.86 (v d2) 5* 21.15200.0300 6* 32.5634 0.2308 1.871 19.48 (v d3) 7* 4.5083 0.3984 8* 5.81250.3218 1.671 19.48 (v d4) 9* 8.0153 0.5455 10* -9.4848 0.4695 1.81585.66 (v d5) 11* -2.5279 0.0542 12* Infinity 0.4000 1.661 20.37 (v d6)13* Infinity 0.2009 14* 9.5270 0.4800 1.535 55.66 (v d7) 15* 1.81070.4000 18 Infinity 0.2100 1.517 04.20 19 Infinity 0.5402 Image PlansInfinity Constituent Lens Data Start Focal Lens Surface Length CompositeFocal Length 1 2 12.873 187 -3.794 2 4 4.852 3 6 -8.018 4 8 29.756 5 106.296 6 12 Infinity 7 14 -3.794 Aspheric Surface Data Second ThirdFourth Fifth Surface Surface Surface Surface k -9.750302E-01-1.955110E+01 -9.736985E+00 0.000000E+00 A4 -2.304075E-03 5.697526E-024.000035E-02 -1.050058E-01 A6 -2.065950E-02 -2.045708E-01 -1.304553E-012.132460E-01 A8 4.381408E-02 2.000827E-01 2.389490E-01 -3.595121E-01 A10-8.079461E-02 -3.309133E-01 -4.03344E-01 5.325768E-01 A12 8.544281E-023.095938E-01 5.002538E-01 -6.176027E-01 A14 -5.830022E-02 -1.554305E-01-3.794960E-01 4.641987E-01 A16 2.471488E-02 7.038912E-02 1.680704E-01-2.048512E-01 A18 -5.75044E-03 -1.663145E-02 -4.038765E-02 4.753002E-02A20 5.540787E-04 1.536908E-03 4.068085E-03 -4.576784E-03 Sixth SeventhEighth Ninth Surface Surface Surface Surface k 0.000000E+00 2.273627E+00-4.690107E+00 -2.407167E-01 A4 -1.057370E-01 -2.730259E-02 -9.354906E-02-6.544646E-02 A6 3.016323E-01 1.122780E-01 7.987488E-02 7.010593E-02 A8-4.453393E-01 -2.307943E-02 -1.891423E-01 -1.771664E-01 A10 5.455151E-01-3.266476E-01 2.919072E-01 2.114259E-01 A12 -5.646294E-01 8.311421E-01-2.495017E-01 -1.421700E-01 A14 3.963026E-01 -1.071945E+00 1.101499E-014.956697E-02 A16 -1.592878E-01 7.931670E-01 -1.930015E-02 -6.751261E-03A18 3.141388E-02 -3.156417E-01 0.000000E+00 0.000000E+00 A20-2.072926E-03 5.257192E-02 0.000000E+00 Tenth Eleventh TwelfthThirteenth Surface Surface Surface Surface k -4.037057E-01 -5.467008E+000.000000E+00 0.000000E+00 A4 -2.304763E-02 5.688192E-02 1.430008E-011.115204E-01 A6 1.070787E-01 -8.094019E-02 -2.353095E-01 -1.753555E-01A8 -1.629105E-01 4.578826E-02 1.356042E-01 9.700517E-02 A10 1.138702E-01-1.857818E-02 -4.708597E-02 -3.033602E-02 A12 -4.569561E-02 4.600627E-039.999184E-03 5.518556E-03 A14 9.465648E-03 -9.132877E-04 -1.154015E-03-5.349903E-04 A16 -7.429063E-04 8.345820E-05 5.472250E-05 2.128087E-05A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+000.000000E+00 0.000000E+00 0.000000E-00 Fourteenth Fifteenth SurfaceSurface k 6.104675E+00 -8.869153E+00 A4 -2.268265E-01 -1.155683E-01 A61.005901E-01 5.738810E-02 A8 -2.222446E-02 -1.713825E-02 A102.684135E-03 3.099353E-03 A12 -1.630619E-04 -3.349846E-04 A143.148502E-06 1.972444E-05 A16 6.130299E-08 -4.820834E-07 A180.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 6 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 12 shows spherical aberration (mm), astigmatism (mm), anddistortion (%) of the imaging lens in Example 6. As shown in FIG. 12,each aberration is corrected excellently.

Example 7

The basic lens data is shown below in Table 7.

TABLE 7 Example 7 Unit mm f = 4.75

 = 3.93

 = 1.50 TTL = 5.53 ω(*) = 30.1 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.3928 2* 2.0542 0.6117 1.544 55.88(v d1) 3* 2.0875 0.1002 4* 2.4150 0.7107 1.544 55.86 (v d2) 5* 18.87460.0305 6* 30.0650 0.2500 1.871 16.48 (v d3) 7* 4.5036 0.3898 8* 5.71210.3220 1.671 19.46 (v d4) 9* 7.8172 0.8418 10* -10.6305 0.4817 1.81555.66 (v d5) 11* -2.8878 0.0823 12* Infinity 0.4088 1.681 20.37 (v d6)13* Infinity 0.2034 14* 8.0408 0.4804 1.535 55.66 (v d7) 15* 1.63260.4000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.5204 Image PlansInfinity Constituent Lens Data Start Focal Lens Surface Length CompositeFocal Length 1 2 12.380 167 -3.856 2 4 4.976 3 6 -8.005 4 8 29.785 5 108.515 6 12 Infinity 7 14 -3.856 Aspheric Surface Data Second ThirdFourth Fifth Surface Surface Surface Surface k -9.583301E-01-1.955118E+01 -9.746335E+00 0.000000E+00 A4 -2.599315E-03 4.893722E-023.189065E-02 -1.272386E-01 A6 -1.786263E-02 -1.671982E-01 -8.072227E-023.602637E-01 A8 3.845098E-02 1.718491E-01 7.970342E-02 -7.674024E-01 A10-8.080038E-02 -1.714782E-01 -1.071444E-01 1.152067E+00 A12 9.522731E-021.838573E-01 1.700883E-01 -1.190406E+00 A14 -7.053398E-02 -1.128146E-01-1.515251E-01 2.991869E-01 A16 3.154440E-02 4.835225E-02 7.368491E-02-3.271606E-01 A18 -7.597686E-03 -1.144787E-02 -1.888570E-02 7.363495E-02A20 7.602824E-04 1.136988E-03 1.999237E-03 -6.960701E-03 Sixth SeventhEighth Ninth Surface Surface Surface Surface k 0.000000E+00 2.273952E+00-4.690830E+00 -2.409372E-01 A4 -1.188277E-01 -2.438403E-02 -9.235077E-02-7.731614E-02 A6 4.088527E-01 9.878848E-02 5.884048E-02 3.452916E-02 A8-7.703182E-01 1.001639E-02 -1.312114E-01 -8.776598E-02 A10 1.069017E+00-3.656509E-01 1.854070E-01 1.078346E-01 A12 -1.079563E+00 8.075428E-01-1.602320E-01 -7.482348E-02 A14 7.246795E-01 -9.451984E-01 7.205141E-022.861431E-02 A16 -2.953460E-01 8.478882E-01 -1.283010E-02 -3.564333E-03A18 5.520327E-02 -2.426357E-01 0.000000E+00 0.000000E+00 A20-5.889967E-03 3.870514E-02 0.000000E+00 0.000000E+00 Tenth EleventhTwelfth Thirteenth Surface Surface Surface Surface k -4.037058E-01-5.467714E-00 0.000000E+00 0.000000E+00 A4 -1.609638E-02 7.183422E-021.489146E-01 1.082736E-01 A6 8.578322E-02 -1.051033E-01 -2.461887E-01-1.691604E-01 A8 -1.373650E-01 6.600289E-02 1.483353E-01 6.340813E-02A10 9.584070E-02 -2.631338E-02 -5.245886E-02 -2.915270E-02 A12-3.825074E-02 7.283295E-03 1.144320E-02 5.26950E-03 A14 7.783989E-03-1.306053E-03 -1.347320E-03 -5.086725E-04 A16 -5.041415E-04 1.071700E-046.486474E-05 1.967430E-05 A18 0.000000E+00 0.000000E+00 0.000000E+000.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E-00Fourteenth Fifteenth Surface Surface k 6.105084E+00 -8.872200E+00 A4-2.323917E-01 -1.179260E-01 A6 1.073645E-01 5.881890E-02 A8-2.520042E-02 -1.753826E-02 A10 3.369148E-03 3.210348E-03 A12-2.525384E-04 -3.480632E-04 A14 9.467401E-06 2.060221E-05 A16-1.258334E-07 -5.035002E-07 A18 0.000000E+00 0.000000E+00 A200.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 7 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 14 shows spherical aberration (mm), astigmatism (mm), anddistortion (%) of the imaging lens in Example 7. As shown in FIG. 14,each aberration is corrected excellently.

Example 8

The basic lens data is shown below in Table 8.

TABLE 8 Example 8 Unit mm f = 4.78

 = 3.93

 = 1.50 TTL = 5.54 ω(*) = 39.0 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.4107 2* 1.9957 0.5750 1.544 55.88(v d1) 3* 2.4000 0.0933 4* 2.1235 0.6071 1.544 55.86 (v d2) 5* 7.80000.0300 6* 27.9856 0.2500 1.871 19.48 (v d3) 7* 9.7272 0.3797 8* 8.58300.3260 1.671 19.45 (v d4) 9* 6.5403 0.4791 10* -7.7808 0.4862 1.52555.66 (v d5) 11* -2.4301 0.1246 12* Infinity 0.4000 1.661 20.37 (v d6)13* Infinity 0.2318 14* 8.1692 0.4806 1.535 55.66 (v d7) 15* 1.87380.4000 18 Infinity 0.2100 1.517 04.20 19 Infinity 0.5253 Image PlansInfinity Constituent Lens Data Start Focal Lens Surface Length CompositeFocal Length 1 2 14.497 187 -4.040 2 4 5.145 3 6 -10.727 4 8 49.977 5 106.405 6 12 Infinity 7 14 -4.040 Aspheric Surface Data Second ThirdFourth Fifth Surface Surface Surface Surface k -8.545408E-01-1.868825E+01 -1.144706E+01 0.000000E+00 A4 -9.703587E-04 6.835842E-025.747625E-02 -1.291330E-01 A6 -1.745493E-02 -1.735987E-01 -5.054763E-024.214031E-02 A8 5.751364E-02 8.239434E-02 -3.813865E-02 5.630412E-02 A10-1.282470E-01 5.540121E-02 8.752429E-02 2.749081E-01 A12 1.577650E-01-9.353544E-02 5.871093E-02 -8.099930E-01 A14 -1.184003E-01 5.609571E-02-1.536973E-01 8.481834E-01 A16 5.053526E-02 -1.769711E-02 1.062134E-01-4.405203E-01 A18 -1.177586E-02 2.767305E-03 -3.347330E-02 1.153043E-01A20 1.131975E-03 -1.536944E-04 4.109167E-03 1.211923E-02 Sixth SeventhEighth Ninth Surface Surface Surface Surface k 0.000000E+00 2.273931E+00-4.691011E+00 -2.394155E-01 A4 -1.190812E-01 -2.106420E-02 -8.514203E-02-7.793831E-02 A6 2.260608E-01 1.085709E-01 -1.510136E-02 1.418414E-02 A8-2.852742E-01 -1.723828E-01 9.607961E-02 -3.429294E-02 A10 7.520757E-012.628245E-02 -1.818491E-01 3.643009E-02 A12 -1.347761E+00 2.049459E-011.715618E-01 -2.309148E-02 A14 1.279528E+00 -3.824796E-01 -8.684838E-028.318187E-03 A16 -6.573125E-01 3.810008E-01 1.810031E-02 -2.600419E-04A18 1.751156E-01 -1.644881E-01 0.000000E+00 0.000000E+00 A20-1.903887E-02 3.163673E-02 0.000000E+00 0.000000E+00 Tenth EleventhTwelfth Thirteenth Surface Surface Surface Surface k -4.037067E-01-5.724413E+00 0.000000E+00 0.000000E+00 A4 8.857513E-03 1.020800E-011.832185E-01 1.227451E-01 A6 2.038901E-02 -2.280711E-01 -3.229402E-01-1.920293E-01 A8 -7.075564E-02 2.142819E-01 2.226415E-01 1.107138E-01A10 5.971340E-02 -1.168890E-01 -9.232555E-02 -3.652889E-02 A12-2.764974E-02 4.046513E-02 2.263471E-02 6.968086E-03 A14 5.985413E-03-7.553717E-03 -2.979854E-03 -7.026578E-04 A16 -3.952858E-04 5.922711E-041.632166E-04 2.884144E-05 A18 0.000000E+00 0.000000E+00 0.000000E+000.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E-00Fourteenth Fifteenth Surface Surface k 5.051585E+00 -8.871487E+00 A4-2.239277E-01 -1.120040E-01 A6 1.000785E-01 5.330826E-02 A8-2.402335E-02 -1.553288E-02 A10 3.519721E-03 2.776633E-03 A12-3.144935E-04 -2.980374E-04 A14 1.578445E-05 1.758790E-05 A16-3.432192E-07 -4.278717E-07 A18 0.000000E+00 0.000000E+00 A200.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 8 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 16 shows spherical aberration (mm), astigmatism (mm), anddistortion (%) of the imaging lens in Example 8. As shown in FIG. 16,each aberration is corrected excellently.

Example 9

The basic lens data is shown below in Table 9.

TABLE 9 Example 9 Unit mm f = 4.82

 = 4.00

 = 1.60 TTL = 5.44 ω(*) = 39.2 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.1018 2* 2.4000 0.4853 1.544 55.86(v d1) 3* 248.1186 0.0783 4* 10.0000 0.6306 1.535 55.68 (v d2) 5*76.4308 0.0300 6* 12.3267 0.2500 1.671 19.46 (v d3) 7* 3.5817 0.3589 8*4.1212 0.2800 1.871 19.48 (v d4) 9* 5.5557 0.5192 10* -7.8793 0.35321.535 55.66 (v d5) 11* -31.1276 0.3072 12* Infinity 0.4708 1.861 20.37(v d6) 13* Infinity 0.1630 14* 7.5450 0.4058 1.535 55.66 (v d7) 15*1.7002 0.4000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.4974 ImagePlans Infinity Constituent Lens Data Start Focal Lens Surface LengthComposite Focal Length 1 2 4.443 187 -4.221 2 4 21.442 3 6 -7.507 4 822.045 5 10 0.449 6 12 Infinity 7 14 -4.221 Aspheric Surface Data SecondThird Fourth Fifth Surface Surface Surface Surface k -2.583865E+009.207880E+01 2.976873E+00 0.000000E+00 A4 -1.124263E-02 -5.510271E-02-1.294490E-02 -1.181040E-01 A6 -4.236373E-02 3.461890E-02 1.150828E-013.509570E-01 A8 7.091386E-02 -8.595310E-02 -2.432615E-01 -6.178434E-01A10 -1.654732E-01 1.767767E-01 4.354209E-01 6.346235E-01 A121.783893E-01 -1.986470E-01 -4.90908E-01 -4.605324E-01 A14 -1.119303E-011.292403E-01 2.854847E-01 2.550786E-01 A16 4.007139E-02 -5.096104E-02-8.998786E-02 -1.004878E-01 A18 -7.846113E-03 1.104253E-02 1.590701E-022.398498E-02 A20 0.548243E-04 -1.022863E-03 -1.083764E-03 -2.386171E-03Sixth Seventh Eighth Ninth Surface Surface Surface Surface k0.000000E+00 1.949826E+00 -4.704160E+00 -2.160308E-01 A4 -1.683838E-01-3.878505E-02 -9.853705E-02 -7.947691E-02 A6 4.967508E-01 2.286917E-015.268821E-02 5.522778E-02 A8 -7.909182E-01 -9.625816E-02 -1.464654E-01-1.775321E-01 A10 7.762338E-01 -6.986643E-01 2.477821E-01 2.568718E-01A12 -4.862202E-01 2.138478E+00 -2.388048E-01 -1.895825E-01 A141.887143E-01 -2.989894E+00 1.199005E-01 8.056291E-02 A16 -3.220088E-022.320890E+00 -2.400013E-02 -1.286567E-02 A18 -3.918024E-03 -8.520785E-010.000000E+00 0.000000E+00 A20 1.820568E-03 1.623987E-01 0.000000E+000.000000E+00 Tenth Eleventh Twelfth Thirteenth Surface Surface SurfaceSurface k -3.908038E-01 -4.913670E+00 0.000000E+00 0.000000E+00 A48.140031E-02 0.096831E-02 8.305868E-02 7.012118E-02 A6 -0.530510E-02-1.457718E-01 -1.736731E-01 -1.404051E-01 A8 3.621620E-02 1.389026E-019.235189E-02 7.101606E-02 A10 -2.004382E-02 -8.415179E-02 -2.489045E-02-1.814775E-02 A12 4.501320E-03 2.998452E-02 2.982269E-03 2.291461E-03A14 -1.665772E-04 -5.878888E-03 1.283530E-05 -1.174821E-04 A160.000000E+00 4.377052E-04 -2.243099E-05 4.863113E-07 A18 0.000000E+000.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+000.000000E+00 0.000000E-00 Fourteenth Fifteenth Surface Surface k4.270619E+00 -8.757146E+00 A4 -2.64846E-01 -1.369948E-01 A6 1.215077E-017.374270E-02 A8 -3.149555E-02 -2.232679E-02 A10 5.015044E-033.888596E-03 A12 -4.378929E-04 -3.957048E-04 A14 2.663770E-052.169251E-05 A16 0.2699945E-07 -4.945457E-07 A18 0.000000E+000.000000E+00 A20 0.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 9 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 18 shows spherical aberration (mm), astigmatism (mm), anddistortion (%) of the imaging lens in Example 9. As shown in FIG. 18,each aberration is corrected excellently.

Example 10

The basic lens data is shown below in Table 10.

TABLE 10 Example 10 Unit mm f = 4.76

 = 3.93

 = 1.60 TTL = 5.54 ω(*) = 39.0 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.2611 2* 2.4000 0.5160 1.544 55.88(v d1) 3* 20.9819 0.1653 4* 10.0000 0.5684 1.535 55.86 (v d2) 5*-45.8181 0.0300 6* 15.5211 0.2500 1.871 19.48 (v d3) 7* 3.8649 0.3241 8*3.8762 0.3024 1.671 19.48 (v d4) 9* 4.7231 0.5248 10* -5.8800 0.40271.525 55.66 (v d5) 11* -2.2765 0.1964 12* Infinity 0.4407 1.661 20.37 (vd6) 13* Infinity 0.2370 14* 7.0002 0.4800 1.535 55.68 (v d7) 15* 1.80870.4000 18 Infinity 1.2100 1.517 04.20 19 Infinity 0.5807 Image PlansInfinity Constituent Lens Data Start Focal Lens Surface Length CompositeFocal Length 1 2 4.931 187 -4.013 2 4 15.409 3 6 -7.732 4 8 28.042 5 106.679 6 12 Infinity 7 14 -4.013 Aspheric Surface Data Second ThirdFourth Fifth Surface Surface Surface Surface k -1.578042E+00-1.968015E+01 2.827835E+00 0.000000E+00 A4 -5.048080E-00 -4.851584E-02-4.497292E-02 -1.110752E-01 A6 -4.957920E-02 -2.178744E-02 6.220331E-023.464784E-01 A8 1.204400E-01 1.213445E-01 -5.470239E-02 -8.951157E-01A10 -2.359108E-01 -2.418858E-01 7.708774E-02 1.370795E+00 A122.748949E-01 3.024030E-01 -5.987169E-02 -1.324690E+00 A14 -1.983443E-01-2.357433E-01 1.585438E-02 8.190226E-01 A16 8.785350E-02 1.114616E-015.382041E-03 -3.128946E-01 A18 -2.164841E-02 -2.857194E-02 -4.128045E-038.658071E-02 A20 2.240495E-03 3.151803E-03 6.930037E-04 -6.126349E-03Sixth Seventh Eighth Ninth Surface Surface Surface Surface k0.000000E+00 2.280547E+00 -4.684969E+00 -2.530434E-01 A4 -7.341316E-02-1.052718E-02 -8.411303E-02 -7.082449E-02 A6 3.670389E-01 3.765614E-02-0.588838E-03 2.985282E-03 A8 -1.010824E+00 1.329634E-01 7.047183E-02-8.684272E-03 A10 1.637073E+00 -7.108769E-01 -1.421888E-01 1.181031E-03A12 -1.713845E+00 1.447525E+00 1.270050E-01 4.368255E-03 A141.187773E+00 -1.609771E+00 -7.078239E-02 -5.508090E-03 A16 -5.207202E-011.033108E+00 1.550075E-02 2.033324E-03 A18 1.237937E-01 -3.582093E-010.000000E+00 0.000000E+00 A20 -1.395882E-02 5.205324E-02 0.000000E+000.000000E+00 Tenth Eleventh Twelfth Thirteenth Surface Surface SurfaceSurface k -4.006818E-01 -5.405158E+00 0.000000E+00 0.000000E+00 A43.913413E-02 1.052597E-01 1.920525E-01 1.269719E-01 A6 -3.598701E-02-2.192776E-01 -3.216343E-01 -1.941981E-01 A8 -1.910302E-03 1.831254E-012.187639E-01 1.108825E-01 A10 1.581088E-02 -8.347364E-02 -9.116332E-02-3.711419E-02 A12 -1.027008E-02 2.363454E-02 2.213519E-02 7.253192E-03A14 1.980848E-03 -3.584884E-03 -2.793763E-03 -7.507837E-04 A160.000000E+00 2.532212E-04 1.398958E-04 3.165895E-05 A18 0.000000E+000.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+000.000000E+00 0.000000E-00 Fourteenth Fifteenth Surface Surface k4.224356E+00 -8.838901E+00 A4 -2.500616E-01 -1.245810E-01 A61.221803E-01 6.024715E-02 A8 -3.143571E-02 -1.714897E-02 A105.036676E-03 2.981166E-03 A12 -5.009306E-04 -3.145798E-04 A142.833720E-05 1.829812E-05 A16 -6.988483E-07 -4.438602E-07 A180.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 10 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 20 shows spherical aberration (mm), astigmatism (mm), anddistortion (%) of the imaging lens in Example 10. As shown in FIG. 20,each aberration is corrected excellently.

Example 11

The basic lens data is shown below in Table 11.

TABLE 11 Example 11 Unit mm f = 4.87

 = 4.00

 = 1.60 TTL = 5.64 ω(*) = 38.5 Surface Data Surface Curvature SurfaceNumber i Radius r Distance d Refractive Abbe (Object) Infinity InfinityIndex Nd Number vd 1(Stop) Infinity -0.2537 2* 2.4030 0.8127 1.544 55.88(v d1) 3* 21.5800 0.1384 4* 10.0000 0.5098 1.535 55.86 (v d2) 5*-73.8085 0.0300 6* 12.2834 0.2500 1.871 16.48 (v d3) 7* 3.7000 0.3590 8*4.3625 0.3129 1.671 19.46 (v d4) 9* 5.4395 0.5270 10* -4.8344 0.43061.5.25 85.66 (v d5) 11* -2.0798 0.1768 12* Infinity 0.4399 1.681 20.37(v d6) 13* Infinity 0.2023 14* 7.4327 0.4800 1.535 55.66 (v d7) 15*1.8279 0.4000 18 Infinity 0.2100 1.517 64.20 19 Infinity 0.6397 ImagePlans Infinity Constituent Lens Data Start Focal Lens Surface LengthComposite Focal Length 1 2 4.921 187 -4.013 2 4 16.503 3 6 -7.980 4 829.380 5 10 8.471 6 12 Infinity 7 14 -4.013 Aspheric Surface Data SecondThird Fourth Fifth Surface Surface Surface Surface k -1.544824E+007.097198E+01 2.833414E+00 0.000000E+00 A4 -9.109778E-03 -4.944760E-02-3.837275E-02 -1.320921E-01 A6 -3.484367E-02 -1.671041E-02 7.957702E-024.634813E-01 A8 8.862121E-02 4.031542E-02 -1.207124E-01 -1.053568E+00A10 -1.917819E-01 -9.341315E-02 1.887281E-01 1.422558E+00 A122.200127E-01 1.182434E-01 -1.711865E-01 -1.238757E+00 A14 -1.598743E-01-9.289088E-02 8.520849E-02 1.043652E-01 A16 6.704978E-02 4.381053E-02-2.207744E-02 -2.513186E-01 A18 -1.548539E-02 -1.121085E-02 2.275796E-035.077028E-02 A20 1.498265E-03 1.184818E-03 1.835322E-05 -4.411004E-03Sixth Seventh Eighth Ninth Surface Surface Surface Surface k0.000000E+00 2.068012E+00 -4.683744E+00 -2.545762E-01 A4 -1.222714E-01-3.533383E-02 -7.352751E-02 -6.722731E-02 A6 5.033130E-01 9.025816E-02-2.111653E-02 6.573551E-03 A8 -1.153035E+00 3.064920E-02 8.359383E-02-3.315094E-02 A10 1.625644E+00 -4.649194E-01 -1.497589E-01 3.721059E-02A12 -1.513007E+00 9.975313E-01 1.383873E-01 -2.200808E-02 A149.413346E-01 -1.092762E+00 -8.811328E-02 8.095517E-03 A16 -3.716607E-018.818258E-01 1.425989E-02 -1.450008E-04 A18 8.316703E-02 -2.294074E-010.000000E+00 0.000000E+00 A20 -7.966257E-03 3.242091E-02 0.000000E+000.000000E+00 Tenth Eleventh Twelfth Thirteenth Surface Surface SurfaceSurface k -3.987671E-01 -4.062325E+00 0.000000E+00 0.000000E+00 A43.583437E-02 8.800351E-02 1.417701E-01 9.536261E-02 A6 -1.020785E-02-1.438646E-01 -2.472084E-01 -1.605159E-01 A8 -1.397487E-02 1.180389E-011.52725E-01 0.016304E-02 A10 1.756701E-02 -4.942707E-02 -5.93663E-02-2.870038E-02 A12 -8.803902E-00 1.266168E-02 1.260936E-02 5.278416E-03A14 1.525615E-03 -1.577735E-03 -1.396227E-03 -5.123742E-04 A160.000000E+00 1.456858E-04 5.796751E-05 0.000000E+00 A18 0.000000E+000.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+000.000000E+00 0.000000E-00 Fourteenth Fifteenth Surface Surface k4.621796E+00 -8.947983E+00 A4 -2.429228E-01 1.146983E-01 A6 1.106290E-025.504301E-02 A8 -2.777021E-02 -1.624333E-02 A10 4.370982E-022.852482E-03 A12 -4.291651E-04 -3.011134E-04 A14 2.403653E-051.742675E-05 A16 -5.877949E-07 -4.195089E-07 A18 0.000000E+000.000000E+00 A20 0.000000E+00 0.000000E+00

indicates data missing or illegible when filed

The imaging lens in Example 11 satisfies conditional expressions (1) to(21) as shown in Table 12.

FIG. 22 shows spherical aberration (mm), astigmatism (mm), anddistortion (%) of the imaging lens in Example 11. As shown in FIG. 22,each aberration is corrected excellently.

In table 12, values of conditional expressions (1) to (21) related tothe Examples 1 to 11 are shown.

TABLE 12 Conditional Example Example Example Example Example Exampleexpression 1 2 3 4 5 6 (1) (D1/11) × 100 4.02 4.74 5.97 5.48 5.35 3.97(2) T2/T4 0.03 0.08 0.07 0.03 0.05 0.08 (3) vd4/(vd5 + vd6) 0.27 0.270.27 0.28 0.26 0.26 (4) (D5/15) × 100 8.24 6.49 8.15 8.27 6.59 7.40 (5)(T2/TTL) × 100 0.54 0.54 0.58 0.54 0.54 0.54 (6) (T4/TTL) × 100 8.548.87 8.90 8.35 8.27 8.80 (7)

8.18 8.17 8.56 8.87 8.83 8.28 (8)

1.40 1.38 1.43 1.29 1.44 1.32 (9)

-0.84 -0.82 -0.82 -0.80 -0.84 -0.80 (10)

1.10 1.12 1.18 1.02 1.10 1.22 (11)

1.47 1.57 1.59 1.23 1.48 1.69 (12)

-1.76 -1.76 -1.82 -1.30 -1.20 -3.95 (13)

3.20 4.03 3.22 1.73 1.75 1.81 (14) r 6/r 7 1.04 0.96 0.80 0.83 0.79 0.73(15) r 7/r 8 0.75 0.74 0.74 0.80 0.74 0.72 (16) r 8/r 9 -0.83 -0.86-0.87 -0.85 -1.24 -0.85 (17) vd 6/vd 7 0.37 0.37 3.37 0.35 0.35 0.37(18) T1/T2 2.46 2.77 4.43 3.83 3.88 2.24 (19) [15/17] 1.87 1.89 1.771.61 1.71 1.68 (20)

-0.84 -0.82 -0.82 -0.86 -0.84 -0.86 (21)

-0.54 -0.53 -0.55 -0.46 -0.48 -0.53 Conditional Example Example ExampleExample Example expression 7 8 9 10 11 (1) (D1/11) × 100 4.14 3.37 10.8410.47 10.42 (2) T2/T4 0.06 0.06 0.06 0.06 0.06 (3) vd4/(vd5 +vd6) 0.260.28 0.26 0.26 0.26 (4) (D5/15) × 100 7.12 7.75 3.80 6.03 6.65 (5)(T2/TTL) × 100 0.85 0.84 0.85 0.84 0.83 (6) (T4/TTL) × 100 9.78 8.859.58 9.48 9.35 (7)

9.26 10.81 4.57 5.83 6.03 (8)

1.37 1.35 1.35 1.40 1.33 (9)

-0.81 -0.85 -0.88 -0.86 -0.82 (10)

1.20 1.17 0.85 0.81 0.90 (11)

1.64 1.38 1.18 0.99 1.12 (12)

-2.25 -1.63 -1.63 -1.24 -6.86 (13)

1.82 1.72 1.56 1.49 1.53 (14) r 6/r 7 0.80 1.03 0.87 1.08 0.85 (15) r7/r 8 0.73 0.85 0.74 0.82 0.80 (16) r 8/r 9 -6.73 -0.86 -0.71 -0.80-1.13 (17) vd 6/vd 7 0.07 0.07 0.07 0.07 0.07 (18) T1/T2 3.29 3.11 2.615.51 4.61 (19) [15/17] 1.69 1.59 2.24 1.60 1.81 (20)

-0.81 -0.85 -0.88 -0.84 -0.82 (21)

-0.86 -0.81 -0.85 -0.46 -0.42

indicates data missing or illegible when filed

When the imaging lens according to the present invention is adopted to aproduct with the camera function, there is realized contribution to thewide field of view, the low-profileness and the low F-number of thecamera and also high performance thereof.

DESCRIPTION OF REFERENCE NUMERALS

-   ST: an aperture stop,-   L1: a first lens,-   L2: a second lens,-   L3: a third lens,-   L4: a fourth lens,-   L5: a fifth lens,-   L6: a sixth lens,-   L7: a seventh lens,-   ih: a maximum image height,-   IR: a filter, and-   IMG: an image plane.

1. An imaging lens comprising, in order from an object side to an imageside, a first lens having a convex surface facing the object side nearan optical axis and positive refractive power, a second lens, a thirdlens, a fourth lens, a fifth lens, a sixth lens, and a seventh lenshaving a concave surface facing the image side near the optical axis andnegative refractive power, wherein an image-side surface of said seventhlens is formed as an aspheric surface having at least one pole point ina position off the optical axis, said second lens has positiverefractive power near the optical axis, and said sixth lens has planesurfaces both on the object side and the image side and is formed as adouble-sided aspheric lens.
 2. An imaging lens comprising, in order froman object side to an image side, a first lens having a convex surfacefacing the object side near an optical axis and positive refractivepower, a second lens, a third lens, a fourth lens, a fifth lens, a sixthlens, and a seventh lens having a concave surface facing the image sidenear the optical axis and negative refractive power, wherein animage-side surface of said seventh lens is formed as an aspheric surfacehaving at least one pole point in a position off the optical axis, animage-side surface of said fourth lens has a concave surface facing theimage side near the optical axis, said fifth lens has positiverefractive power near the optical axis, an object-side surface of saidseventh lens has a convex surface facing the object side near theoptical axis, and below conditional expressions (1) and (2) aresatisfied:1.50<(D1/f1)×100<17.00  (1)0.02<T2/T4<0.10  (2) where D1: a thickness along the optical axis of thefirst lens, f1: a focal length of the first lens, T2: a distance alongthe optical axis from an image-side surface of the second lens to anobject-side surface of the third lens, and T4: a distance along theoptical axis from an image-side surface of the fourth lens to anobject-side surface of the fifth lens.
 3. The imaging lens according toclaim 1, wherein an image-side surface of said fourth lens has a concavesurface facing the image side near the optical axis.
 4. The imaging lensaccording to claim 1, wherein a below conditional expression (3) issatisfied:0.10<νd4/(νd5+νd6)<0.40  (3) where νd4: an abbe number at d-ray of thefourth lens, νd5: an abbe number at d-ray of the fifth lens, and νd6: anabbe number at d-ray of the sixth lens.
 5. The imaging lens according toclaim 1, wherein a below conditional expression (4) is satisfied:1.50<(D5/f5)×100<12.50  (4) where D5: a thickness along the optical axisof the fifth lens, and f5: a focal length of the fifth lens.
 6. Theimaging lens according to claim 2, wherein a below conditionalexpression (5) is satisfied:0.20<(T2/TTL)×100<0.90  (5) where T2: a distance along the optical axisfrom an image-side surface of the second lens to an object-side surfaceof the third lens, and TTL: a total track length.
 7. The imaging lensaccording to claim 2, wherein a below conditional expression (6) issatisfied:6.70<(T4/TTL)×100<15.00  (6) where T4: a distance along the optical axisfrom an image-side surface of the fourth lens to an object-side surfaceof the fifth lens, and TTL: a total track length.
 8. The imaging lensaccording to claim 1, wherein a below conditional expression (2) issatisfied:0.02<T2/T4<0.10  (2) where T2: a distance along the optical axis from animage-side surface of the second lens to an object-side surface of thethird lens, and T4: a distance along the optical axis from an image-sidesurface of the fourth lens to an object-side surface of the fifth lens.9. The imaging lens according to claim 2, wherein a below conditionalexpression (7) is satisfied:2.00<f4/f<16.00  (7) where f4: a focal length of the fourth lens, and f:the focal length of the overall optical system of the imaging lens. 10.The imaging lens according to claim 1, wherein a below conditionalexpression (8) is satisfied:0.50<f5/f<3.00  (8) where f5: a focal length of the fifth lens, and f:the focal length of the overall optical system of the imaging lens. 11.The imaging lens according to claim 2, wherein a below conditionalexpression (9) is satisfied:−1.40<f7/f<−0.40  (9) where f7: a focal length of the seventh lens, andf: the focal length of the overall optical system of the imaging lens.12. The imaging lens according to claim 2, wherein a below conditionalexpression (10) is satisfied:0.40<r7/f<1.90  (10) where r7: paraxial curvature radius of anobject-side surface of the fourth lens, and f: the focal length of theoverall optical system of the imaging lens.
 13. The imaging lensaccording to claim 1, wherein a below conditional expression (11) issatisfied:0.50<r8/f<2.60  (11) where r8: paraxial curvature radius of theimage-side surface of the fourth lens, and f: the focal length of theoverall optical system of the imaging lens.
 14. The imaging lensaccording to claim 2, wherein a below conditional expression (12) issatisfied:−3.50<r9/f<−0.50  (12) where r9: paraxial curvature radius of anobject-side surface of the fifth lens, and f: the focal length of theoverall optical system of the imaging lens.
 15. The imaging lensaccording to claim 1, wherein a below conditional expression (13) issatisfied:0.70<r13/f<6.50  (13) where r13: paraxial curvature radius of anobject-side surface of the seventh lens, and f: the focal length of theoverall optical system of the imaging lens.
 16. The imaging lensaccording to claim 2, wherein a below conditional expression (14) issatisfied:0.40<r6/r7<1.60  (14) where r6: paraxial curvature radius of animage-side surface of the third lens, and r7: paraxial curvature radiusof an object-side surface of the fourth lens.
 17. The imaging lensaccording to claim 1, wherein a below conditional expression (15) issatisfied:0.30<r7/r8<1.30  (15) where r7: paraxial curvature radius of anobject-side surface of the fourth lens, and r8: paraxial curvatureradius of an image-side surface of the fourth lens.
 18. The imaging lensaccording to claim 1, wherein a below conditional expression (16) issatisfied:−1.90<r8/r9<−0.30  (16) where r8: paraxial curvature radius of animage-side surface of the fourth lens, and r9: paraxial curvature radiusof an object-side surface of the fifth lens.
 19. The imaging lensaccording to claim 2, wherein a below conditional expression (13) issatisfied:0.70<r13/f<6.50  (13) where r13: paraxial curvature radius of anobject-side surface of the seventh lens, and f: the focal length of theoverall optical system of the imaging lens.
 20. The imaging lensaccording to claim 2, wherein a below conditional expression (16) issatisfied:−1.90<r8/r9<−0.30  (16) where r8: paraxial curvature radius of animage-side surface of the fourth lens, and r9: paraxial curvature radiusof an object-side surface of the fifth lens.